Mechanism for making thread-protectors.



P. J. SHRUM.

MECHANISM FOR MAKING THREAD PROTECTORS.

APPLICATION FILED FEB.24. 1914.

INVENTOR WITNES Ell Ell?

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PETER Cl. SERUM, F MONACA, PENNSYLVANIA. ASSIGNOR. T0 COLDNA. MANUIB'AC- TUBING COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION 013" PENN- SYLVANIA.

MECHANISM FOR MAKING THREAD-PROTECTOEEL To all whom it may concern:

Be it known that I, Peres J. SERUM, a citizen of the United States, residing at h/lonaca, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Mechanism for Making Thread-Protectors, of which the following is a specification.

lily invention consists of an improvement in mechanism for making thread protectors or similar articles from longitudinal cylindrical sections of metal tubing, and has for its object particularly to form devices of this kind for the purpose of making thread protectors, of the type disclosed in the prior patent of Apr. 523, 1912. No.

I 1623969 issued to mvselt William U. llae and Joseph ll". Ripper.

The protector consists of a cylindricalshell having a contracted end portion tor the threads, a bulging clearance portion near the other end, and an inwardly turned limiting flange.

ilhe device is formed from tubing, pretterablv seamless tubing, by an upsetting process, whereby to turn the one end of the hlanlr inwardly, reducing its internal diamto provide the limiting flange, and at the same time forcing the other end longitudinally oi the blank, and also drawing it int-vardl r tor the threaded portion, the operation being performed in one continuous step, by means oi suitable dies.

la the drawings illustrating the die mechanism for carrying out such operation or method, i ligure 1 shows the upper and lower die in open position, with the tubular hlanlr inserted. ready for the operation. Fig. 9; is a similar view, showing the dies closed together at the end or the operation. 3 is a sectional view of the dies, like 1, showing the operation of stripping the finished protector from the u per die. Fig. l is a plan view of the lower die. Fig. 5 is a longitudinal sectional view ot the longitudinally pressed blank, as tormed between the dies. Fig. 6 is a lan view of the device. ig. 7 is a vertica sectional view of the finished protector, provided with the attachin threads, and in operative relation to the end of the pipe. shown in dotted lines.

in the drawings, the blank 11 consists of a section of tubin of the required length, diameter, and thic ess to produce the tin Specification of Letters Patent.

Patented Nov. 2%, lltlll.

Application filed February 5%, 1914. Serial No. 320,399.

ished article for attachment upon the threaded end of the pipe to be protected and of the particular size for which the protector is designed. The blank should be of such a length as to provide at its upper portion a straight section or neck I) which is to be slightly constricted or reduced in diameter, and a lower bul 'ng or rounded section 0. the terminal e go of which is to be turned inwardly to form the limiting flange (1, as clearly shown in Figs. 5 and 6.

The dies for forming the device consist of a lower, preferably stationary, die 9 and an upper vertically movable die 3(l, adapted to be mounted in and actuated by the reciprocating head A. of a suitable press. The lower die 2 is provided with a bowlshaped cavity l. of a diameter adapted to receive the end of the blank a, rounded inwardlv toward the center. whereby to force the edge oi the blank inwardly as it is pressed downwardly by the upper c0mpound die 3-6. At the center of the lower the 2 is a circular abutment 5, extend ing upwardly sullicientl v far to provide a limiting central core for the inwardlv swagcd edge. of the blank. as indicated in Fig, "2. The upper outer die 3 is secured to head and is provided with a cylindrical telescoping mandrel die 6 supported by an upper limiting flange 7 upon an annular shoulder 8. a clearance space 9 being provided above die ('3, preferably in head .Mto allow for upward movement of die 6. as in Fig. 9..- Uuter die 3 is provided with an annular flaring wall 10 of hell form. adapted to compress the entering edge port on l) of the blank inwardly toward the terminal 11 0t die 6. Said terminal is reduced in diameter to provide a mandrel bearing for the contracted end 2'; of the tormed article. beyond an annular shoulder 12. The depth of clearance cavitv 9 is substantially equal to the length of the straight neclr I), which engages shoulder 12 and orces die 6 upwardly, as in Fig. 2. The space for there: mainder of the protector, comprising the rounded bulging portion a, is dividedbe? tween the depth of the flaring bell portion 10 and of the bowl-shaped or dished portion 4 of the die 2.

Centrally of die 6 and extending upwardly through head'A is a knock-out rod 13 having at its lower end a knock-out disk or abutment It and at its upper end a limiting nut or collar l5. An arresting bar 16 e2:- tends through a clearance opening 117 in head it, against which the upper end of rod 13 strikes, as the finished article is raised oy the upper die and the holding action of the compressed ring around teal ll, ltod 13 being thus arrested, disk it engages against the inwardly lmrned flange d, forcibly detaching the finished article from the central die, as in Fig. 3,, allowing it to drop 0d, leaving the machine ready for the next operation. llfhen the dies are brought together, the opposite end portions of the blank will be drawn inwardly, the maximum diameter of the blanlr being substantially retained in the crown oi the bulging portion 0. The metal in the end retaining lip or flanged and in the thread providing portion or neclr "o is'therelore compressed or densified, thereby increasing its strength and enduring qualities, and providing for cutting ol' the threads in the :1 shed article. Such finished article, as shown in Fig. 7, is provided with the interior threads ll tapped (ac-extensively with the length of the inner straight portion of the neclr h, and when the protector is screwed upon the pipe, as indicated, its movement is limited by the terminal flange cl, while at the same time practically covering the entire threaded portion of the tube,

By the above described method l am enabled to dispense with the use of interior mandrels heretofore employed and to pro duos the finished article in one operation, ready for the threading ste,

lit will he understood that the size, proportions, and other elements of the dies are to he designed for each particular size, shape, and gage or protector, and that the operation may he performed in connection with any suitable forming mechanism having other details of construction, within the province of the chilled mechanic.

Having described my invention, what l claim is:

l; Die mechanism comprising a series of dies movable relatively toward each other and embodying a terminal pair of dies adapted while maintaining the normal diameter or? a tubular hlenlr to terminally constrict and endwise swsge one end of the hlanlr while its opposite end is being constricte'd by an opposing die of said series.

2. Die meehanim consisting of two memhers adapmd to constrict the terminal portions at a tubular hlanh while maintaining its middle portion maximum diameter, and a die movable into one of first named dies adapte cooperation said oth die swaging on the anionic 8. Die mechanism for swaging open ended tubular blanks, comprising oppositely acting dies, one of said dies having a circular bowl-shaped cavity, and the other having a flaring circular opening confronting said cavity, and a central longitudinally movable concentric co-acting swaging portion, substantially .as set forth.

4. Die mechanism for swaging openended tubular blanks, comprising oppositely acting dies, one of said dies having a circular bowl-shaped cavity, and the other having a daring circular opening confronting said cavity movable concentric portion provided with a reduced shouldered co-acting interior swaging terminal, substantially as set forth.

5. Die mechanism for swaging openended tubular blanks, comprising oppositely acting dies, one of said dies having a circular bowl-shaped cavity, and the other having a daring circular opening confronting said cavity and a central longitudinally movable concentric co-acting swa'ging portion, and kicker mechanism for removing the finished article, substantially as set forth.

6., lln die mechanism for swaging openended tubular blanks, the combination with a lower die having a circular howl-shaped cavity, of an upper circular reciprocable die provided with an inner concentric telescoping' shouldered co-acting swaging portion confronting said cavity, a reciprocable actuating head, a h'cker rod provided with a contacting terminal, and means for limiting the travel of thc'kicker rod, substantially as set forth.

7. lo die mechanism for swaging open ended tubular blanks, the combination with a lower die having a circular bowl-shaped cavity, of an upper co-acting die-having. a central circular daring opening registering therewith, a relatively movable co-acting swaging central die therein having a reand a central longitudinally Mill) duced shouldered terminal and a supporting flange operable within the surroundin die, a reciprccable actuating head provide with a clearance cavity for the central die, a ln clrer rod extending vertically through the center of said mechanism provided with.

a contacting terminal and a limiting abutment at its upper end, and a stationary coacting arresting abutment therefor, substsntiallyas set forth.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

PET-Ell d. SHRUM. 

